#include <bits/stdc++.h>

using namespace std;

class Solution
{
public:
    int maxProfit(vector<int> &prices, int fee)
    {
        vector<vector<int>> dp(prices.size(), vector<int>(2, 0));
        dp[0][0] = -prices[0];
        for (int i = 1; i < (int)prices.size(); i++)
        {
            dp[i][0] = max(dp[i - 1][0], dp[i - 1][1] - prices[i]);
            dp[i][1] = max(dp[i - 1][1], dp[i - 1][0] + prices[i] - fee);
        }
        return dp[prices.size() - 1][1];
    }
};

int main()
{
    vector<int> prices{1, 3, 2, 8, 4, 9};
    Solution sol;
    cout << sol.maxProfit(prices, 2) << endl;
    return 0;
}